462 Forestry Quarterly. 



five years a new classification becomes necessary, while shaft-form 

 classes, as made by Heck (see Quarterly, vol. Ill p. 40) remain 

 more constant. 



In all stem classes the cross section area increment varies 

 greatly from year to year according to treatment, season, and 

 peculiarity of species. The East- West diameter is in the average 

 several millimeters larger than the North-South diameter. 



The better shaft form produces the larger increment, at least in 

 beech. The thinning after Heck in spite of the smaller cross sec- 

 tion area produces a larger and at the same time more valuable 

 increment than a moderate thinning after Kraft. In two experi- 

 ment areas this difference in ten years was 35% and 10% re- 

 spectively, in one area 6% less, average 12%. In comparison 

 with the old method, this larger area and value increment is se- 

 cured on a smaller stock capital, hence a higher interest on the 

 value of the stand is secured, and the latter method continuously 

 improves this relation, approaching the ideal stand, the best stems 

 becoming more and more prononunced and prominent in making 

 up the stand. 



Ein Jahrzehnt Durchforstungsversuch, etc. Zeitschrift fur Forst- u. 

 Jagdwesen. May- August, Pp. 281-313; 382-408; 436-472; 502-520. 



Some interesting notes on the silvics of 

 The Silvics Piiion Pine are given by Phillips. Of par- 



of ticular interest are those relating to the un- 



Pinon Pine. favorable conditions of moisture, altitude, 



and soil which this tree is capable of resist- 

 ing. Besides its value as a cover for arid regions the Pinon Pine 

 is of considerable economic importance. The wood is largely 

 used for fuel and possesses high fuel values. The seed is sold in 

 large quantities as a delicacy. 



The wood is cut after it has been dead two years as before that 

 time it is unseasoned and if left for a longer period of time will 

 have deterioriated. The wood has been used for posts and ties, 

 but is not durable in contact with the soil and needs preservative 

 treatment for this reason. Extensive tracts have given a yield of 

 ten to twelve cords to the acre. 



The fruit is gathered in immense quantities, single dealers have 

 been reported as handling 20,000 to 50,000 pounds. During seed 

 years native collectors sell the seed at five to fifteen cents a pound. 



